JP2018174993A - Chair load support member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a load supporting member for a chair capable of improving an allowable range of a deformation amount when elastically deformed by receiving a load. SOLUTION: An elastically deformable load support surface material 8 having a load support surface formed in a convex curved shape protruding to the front side (one side in one direction) and receiving a load, and an outer peripheral edge of the load support surface material 8. It has an elastically deformable outer peripheral frame portion 9 formed in an annular shape along the portion to support the load supporting surface material 8, and the load supporting surface material 8 is provided on the outer peripheral edge portion and is provided with the outer peripheral frame portion 9. It has a connecting portion 81 to be connected and a main body portion 82 which is continuously provided with the connecting portion 81 inside the connecting portion 81 to form a load supporting surface, and is more easily deformed elastically than the outer peripheral frame portion 9. The connecting portion 81 is composed of a front side connecting portion (first connecting portion) 811 connected to the outer peripheral frame portion 9 from the front side and an inner connecting portion (second connecting portion) connected to the outer peripheral frame portion 9 from the inside. Connection part) 812, and. [Selection diagram] FIG. 9

Description

  The present invention relates to a load support member for a chair.

BACKGROUND Conventionally, a lumbar support for supporting the waist of a seated person sitting on a chair and a load support member for a chair such as a headrest supporting a head are known. For example, in Patent Documents 1 and 2, a lumbar support in which a load supporting surface material constituting a load supporting surface for supporting a load from a seated person is formed of an elastically deformable soft resin such as a urethane elastomer is used. It is disclosed. Such a lumbar support can be elastically deformed by the load received by the load bearing surface member from the seated person to be shaped according to the seated person's body shape, thereby supporting the seated person's waist.
The load supporting surface material of the lumbar support is configured so as not to be elastically deformed in a direction other than the direction of receiving a load from the seated person, because the outer peripheral edge portion is supported by the frame material or the like.

  By the way, when the allowable range of the amount of deformation when being elastically deformed by receiving a load in the lumbar support is large, the waist of the seated person can be supported in a state where the lumbar support is greatly elastically deformed. For example, when the seat occupant is large in size and a large load acts on the lumbar support, the lumbar support can support the waist of the seat occupant in a state of large elastic deformation according to the load, and the seat occupant is comfortable It can be seated.

Patent No. 4823548 gazette Patent No. 5167500 gazette

However, in the lumbar support disclosed in Patent Document 1, the pad material at which the seat occupant's waist hits is configured such that the deformation limit of the pad material is reached when the pad material abuts against the base member positioned behind it. In other words, the base member is a wall in contact with the pad material. That is, in the lumbar support disclosed in Patent Document 1, the range in which the pad material can be elastically deformed backward is small.
Further, in the lumbar support disclosed in Patent Document 2, there is no member serving as a wall behind the protruding member to which the seat occupant's waist rests, so the deformation tolerance of the protruding member itself is improved compared to the configuration of Patent Document 1. It is done. However, since the directionality is limited to the front and back direction, there is room for further improvement in terms of the amount of deformation.
For this reason, a load supporting member for a chair having a large allowable range of deformation when elastically deformed under a load is desired.

  Then, an object of this invention is to provide the load supporting member for chairs which can improve the tolerance | permissible_range of the deformation amount at the time of receiving a load and elastically deforming.

  In order to achieve the above object, a load support member for a chair according to the present invention is a load support member for a chair which is attached to a chair and receives a load directed from one side to the other side in one direction of a seater of the chair An elastically deformable load support surface material having a load support surface formed in a convex curved shape protruding to one side in the one direction and having the load support surface receiving the load, and an annular shape along the outer peripheral edge of the load support surface material A connection portion which is formed and which supports the load supporting surface member and which is elastically deformable, the load supporting surface member being provided at an outer peripheral edge portion and connected to the outer peripheral frame portion; An inner portion of the connecting portion is provided continuously with the connecting portion and has the load supporting surface formed thereon, and is configured to be elastically deformed more easily than the outer peripheral frame portion, and the connecting portion is configured to One of the one direction with respect to the outer peripheral frame A first connecting portion connected from, and having a second connecting portion connected from the inside against the outer peripheral frame portion.

In the present invention, when the load of the seat occupant acts on the load supporting member for a chair, the load acts on the load bearing surface of the load bearing surface material projecting to one side in the one direction, and the connection portion of the load bearing surface material is A load acts on the outer peripheral frame portion.
The load support surface member is configured to be elastically deformed more easily than the outer peripheral frame portion. Therefore, when the load support member for a chair receives a load, first, the load support surface member is elastically deformed with a small load, and the load When it becomes larger, the load is transmitted from the load supporting surface material to the outer peripheral frame portion, and the outer peripheral frame portion is elastically deformed. The load transmitted to the outer peripheral frame portion is a load in a direction in which the load support surface material is elastically deformed, so the outer peripheral frame portion is elastically deformed in the direction in which the load support surface material is elastically deformed. As a result, the restraint force that the outer peripheral frame portion restrains the elastic deformation of the load support surface material is weakened, so that the load support surface material can also be elastically deformed. As described above, it is possible to improve the allowable range of the amount of deformation when being elastically deformed by receiving the load of the load supporting surface material. The term “elastically deformable” indicates, for example, properties such as relatively low rigidity and easy deformation when a load is applied, or large amount of deformation.

Here, in the present invention, the connecting portion connected to the outer peripheral frame portion of the load supporting surface material is connected to the first connecting portion connected from one side in one direction with respect to the outer peripheral frame portion, and the outer peripheral frame portion. And a second connection connected from the inside. Thereby, the load can be easily transmitted from one side to the other side in one direction from the first connection portion to the outer peripheral frame portion, and the load from the first connection portion to the outer peripheral frame portion from the inner side to the outer side Is easy to communicate.
The direction of the load transmitted to the outer peripheral frame portion by the elastic deformation of the load supporting surface material is mainly a direction from one side to the other side in one direction and a direction from the inner side to the outer side of the outer peripheral frame portion. For this reason, when the load of the seat occupant acts on the load supporting surface, the load can be efficiently transmitted from the load supporting surface material to the outer peripheral frame portion, and the outer peripheral frame portion can be efficiently elastically deformed. As a result, the load bearing surface material can be further elastically deformed, and the allowable range of the amount of deformation when the load bearing surface material is elastically deformed by receiving the load can be improved.
Thus, the seat load support member can support a target site such as a waist or a head of a seated person in a state of being elastically deformed largely according to the load, and the seated person can be seated comfortably.

In the chair load support member according to the present invention, the connection portion may have a third connection portion connected to the outer peripheral frame portion from the outside.
With such a configuration, the connection portion can be securely connected to the outer peripheral frame portion, and the load support surface material can be prevented from being detached from the outer peripheral frame portion.

Further, in the chair load support member according to the present invention, the outer peripheral frame portion may have a curved portion which curves outward at least in part.
With such a configuration, the outer peripheral frame portion is easily elastically deformed outward at the curved portion. Moreover, the deformation | transformation property of an outer periphery frame part can be adjusted by providing a curved part in a desired position with respect to an outer periphery frame part. For example, by providing a curved portion in a part of the outer peripheral frame portion, it is elastically deformed in a certain direction so as to be easily bent, or elastically deformed uniformly by providing a curved portion in the entire outer peripheral frame portion. Can be easily bent.

Further, in the chair load support member according to the present invention, the outer peripheral frame portion is a first outer peripheral frame portion extending along a part of the outer peripheral edge portion of the load support surface material, and the outer peripheral edge of the load support surface material A second outer peripheral frame extending along other than the part of the part, and one end of the first outer peripheral frame and one end of the second outer peripheral frame cross each other It joins, and it joins so that the other end of said 1st perimeter frame and the other end of said 2nd perimeter frame may intersect, and said 1st perimeter frame is said 2nd perimeter frame and The second curved portion may be curved toward the side away from the second outer peripheral frame, and the second curved portion may be curved toward the side away from the first outer peripheral frame.
With such a configuration, a joint between one end of the first outer peripheral frame and one end of the second outer peripheral frame, and the other end of the first outer peripheral frame and the second outer periphery Starting from the joint with the other end of the frame, the first outer peripheral frame and the second outer peripheral frame can be elastically deformed and curved in directions away from each other. Then, by adjusting the positions of the first outer peripheral frame portion and the second outer peripheral frame portion, the first outer peripheral frame portion and the second outer peripheral frame portion can be elastically deformed and curved so as to be separated in a desired direction. it can.
For example, by disposing the first outer peripheral frame at the upper side and disposing the second outer peripheral frame at the lower side, the first outer peripheral frame and the second outer peripheral frame may be curved to be vertically separated. it can.

Further, in the chair load support member according to the present invention, the outer frame portion may be formed such that the dimension in the width direction which is the horizontal direction orthogonal to the one direction is larger than the dimension in the vertical direction.
With such a configuration, the outer peripheral frame portion is more easily elastically deformed in the vertical direction than in the width direction. For this reason, the load bearing surface material can be configured to be elastically deformed more easily in the vertical direction than in the width direction.

Further, in the load support member for a chair according to the present invention, when adjusting the positions of the load support surface material and the outer peripheral frame at a joint portion between the first outer peripheral frame and the second outer peripheral frame. An operation unit that can be gripped by the user may be provided.
With such a configuration, when the user grips the operation unit and performs position adjustment, the load that the outer peripheral frame receives from the operation unit is the load between the first outer peripheral frame and the second outer peripheral frame. Act on joints. The joint portion between the first outer peripheral frame portion and the second outer peripheral frame portion has higher strength than the other portions of the first outer peripheral frame portion and the second outer peripheral frame portion. Therefore, even if the position adjustment performed by the user holding the operation unit is frequently performed, the outer peripheral frame portion can be prevented from being damaged or deformed by the load received from the operation unit.

  According to the present invention, it is possible to improve the allowable range of the amount of deformation when being elastically deformed by receiving a load.

It is a perspective view showing an example of a chair provided with a load supporting member for chairs (lumbar support) concerning an embodiment of the present invention. It is another perspective view which shows an example of the chair in which the load support member for chairs which concerns on embodiment of this invention was provided. FIG. 7 is a perspective view of a portion of a backrest according to an embodiment of the present invention. It is a cross-sectional perspective view explaining the lower frame material of the backrest by embodiment of this invention. FIG. 7 is an exploded perspective view of a backrest according to an embodiment of the present invention. It is a front view which shows the lower part side of the backrest by embodiment of this invention. It is the sectional view on the AA line of FIG. It is the BB sectional drawing of FIG. It is the CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is the EE sectional view taken on the line of FIG. (A) is a front view of the 1st attachment member by embodiment of this invention, (b) is a side view of (a), (c) is a rear view of (a). (A) is a front view of the 2nd attachment member by embodiment of this invention, (b) is a side view of (a), (c) is a rear view of (a). It is the FF sectional view taken on the line of FIG. It is a figure explaining the 2nd attachment member attached to the lower frame material. It is another figure explaining the 2nd attachment member attached to the lower frame material. (A) is a figure explaining a mode that load applied to lumbar support, (b) is a figure explaining a mode that load further applied to lumbar support.

Hereinafter, a load support member for a chair according to an embodiment of the present invention will be described based on FIGS. 1 to 17.
The chair 11 shown in FIG. 1 includes a leg 13 installed on the floor surface 12, a box-shaped support base 14 installed on the upper part of the leg 13, and a seat support attached to the upper part of the support base 14. A seat member 16 slidably supported by the seat support member 15 and capable of being seated by a seated person, and a backrest 1 capable of supporting the back of the seated person extending from the support base 14 and seated on the seated body 16; Have. The lumbar support 4 of the backrest 1 of the chair 11 is a load support member for a chair.

The leg portion 13 has a multi-leg 131 with castors 131 a, and a leg post 132 which is erected from the central portion of the multi-leg 131 and incorporates a gas spring (not shown) which is an elevating mechanism.
The outer cylinder 133 which constitutes the lower part of the pedestal 132 is non-rotatably fitted to and supported by the various legs 131. The inner cylinder 134 constituting the upper portion of the pedestal 132 has the support base 14 fixedly supported at the upper end, and the lower portion is rotatably supported by the outer cylinder 133 in the horizontal direction.

The support base 14 incorporates a lift adjustment mechanism of the pedestal 132 and a tilt adjustment mechanism of the backrest 1.
The seat receiving member 15 has four link arms (not shown) attached to the upper portion of the support base 14 and a pair of left and right fixed frames (not shown) for connecting the link arms.
The seat 16 includes a seat frame 161 and a face material 162 stretched on the seat frame 161.

The backrest 1 comprises a backrest support member 21 as a strength member pivotally supported by the support base, a backrest main body 22 supported on the front side of the backrest support member, and a part of the backrest main body 22. It has a face material 3 installed in the inner peripheral space of the back frame member 22 a that defines the outer peripheral shape of the main body 22, and a lumbar support 4 attached to the back support member 21. Illustration of the face material 3 is abbreviate | omitted except FIG. 1 and FIG.
The lumbar support 4 is disposed at a position corresponding to the waist of a seater seated on the chair 11. In the present embodiment, the lumbar support 4 is configured to receive a load of a seated person from the front side (one side) to the rear side (the other side) in the front-rear direction (one direction).

  The backrest supporting member 21 has a lower side portion 211, a side side portion 212, and an upper side portion 213. The lower side portion 211, the side side portion 212, and the upper side portion 213 are integrally formed of, for example, a metal such as aluminum or a resin having a predetermined strength.

The lower side portion 211 is connected to the tilt adjustment mechanism in the support base 14 and is provided so as to extend from the left and right sides of the rear of the support base 14 respectively. The lower side portion 211 is inclined so as to gradually move rearward as going upward. Further, the lower side portion 211 is provided with an armrest arranged on the side of the seat body 16 respectively.
Two side portions 212 are formed continuously to the upper end portions of the two lower side portions 211, respectively. The side portions 212 are inclined so as to gradually go outward in the width direction (sides away from each other) as going upward respectively.
The lower side of the side portion 212 is inclined to be gradually forward as it goes upward. The upper side of the side portion 212 is inclined so as to be gradually rearward toward the upper side. Top portions of the two side portions 212 are connected by an upper side portion 213.

  The backrest main body 22 includes a pair of vertical frame members 221 disposed apart in the width direction of the backrest 1, an upper frame member 222 connecting the upper ends of the pair of vertical frame members 221, and a pair of vertical frame members And a lower frame member 223 connecting the lower ends of the lower and upper members 221. The pair of vertical frame members 221, the upper frame member 222, and the lower frame member 223 are integrally formed of, for example, a resin or the like in an annular shape, and are configured to be elastically deformable in accordance with the force acting from the surface member 3. The pair of vertical frame members 221, the upper frame member 222, and the lower frame member 223 are combined to form a back frame member 22a.

  At the outer peripheral edge of each of the pair of vertical frame members 221, the upper frame member 222 and the lower frame member 223, groove portions 224 recessed toward the inside of the backrest 1 are continuously formed in the circumferential direction. The groove portion 224 is configured such that the outer peripheral end of the face material 3 is caught and the face material 3 is locked. The face material 3 is disposed on the front side of the backrest main body 22 and is wound so that the vicinity of the outer peripheral edge wraps around the outside of the backrest main body 22, and the outer peripheral edge engages with the groove portion 224. The face material 3 is configured to receive the load of a seated person who leans on the backrest 1.

The pair of vertical frame members 221 extend in the vertical direction. In detail, the pair of vertical frame members 221 slopes gradually inward in the width direction as it goes downward. As shown in FIG. 3, a pair of vertical frame members 221 (only one vertical frame member 221 is shown in FIG. 3) is disposed on the outer side in the width direction, and a base portion 221a in which a groove portion 224 is formed; And a protruding portion 221b that protrudes forward as it goes inward in the width direction from the rear edge portion of 221a. The base portion 221 a and the projecting portion 221 b are formed over the entire length direction (height direction) of the pair of vertical frame members 221, respectively.
As shown in FIG. 2, an upper connecting portion 225 and a lower connecting portion 226 extending rearward are integrally formed on the upper and lower portions of each of the pair of vertical frame members 221. Front end portions (rear end portions) of the upper connecting portion 225 and the lower connecting portion 226 are connected to the side portion 212 of the back support member 21 respectively.
As shown in FIG. 1, the upper frame member 222 extends in the width direction, and both end portions in the width direction are connected to the upper end portions of the pair of vertical frame members 221. The upper frame member 222 is curved so that the central portion in the width direction protrudes upward beyond both end portions.

The lower frame member 223 extends in the width direction, and both end portions in the width direction are connected to lower end portions of the pair of vertical frame members 221. The lower frame member 223 is curved so that the central portion in the width direction protrudes downward than both end portions. The lower frame member 223 is configured such that the lumbar support 4 is removable.
As shown in FIG. 3 and FIG. 4, the lower frame member 223 gradually protrudes forward as it goes upward from the base 23 on the lower side and the groove part 224 is formed, and the rear edge of the base 23. It has a protrusion 24 and a concave recess 25 surrounded by the base 23 and the protrusion 24. The base 23, the protrusion 24 and the recess 25 are formed over the entire length direction (width direction) of the lower frame member 223.

A portion of the upper surface 23a of the base portion 23 which is disposed on the front side of the projection 24 is formed to be a surface facing upward. The groove portion 224 formed in the base portion 23 is opened in the obliquely rearward direction which is the lower side and the rear side.
The base portion 23 is integrally formed such that both end portions in the width direction are continuous with the lower end portion of the base portion 221 a of the vertical frame member 221.

The projecting portion 24 is disposed on the base end side (the base 23 side), and has a plate-like portion 26 formed in a plate shape having a substantially uniform thickness along the direction of projecting from the base 23 and a plate And a bulging portion 27 which is thicker than the portion 26 and bulging. The base portion 23, the plate portion 26 and the bulging portion 27 are integrally formed.
The surface facing the front side and the lower side of the plate-like portion 26 is referred to as a front surface 26a, and the surface facing the rear side and the upper side is referred to as a rear surface 26b. The front surface 26 a of the plate-like portion 26 is continuous with the upper surface 23 a of the base 23.
The front surface of the bulging portion 27 is curved to project forward.
The projecting portion 24 is integrally formed such that both end portions in the width direction are continuous with the lower end portion of the projecting portion 221 b of the vertical frame member 221.

The recess 25 is a recess formed by the front surface 26 a of the plate-like portion 26 of the protrusion 24 and the upper surface 23 a of the base 23 and is open on the front side. The upper surface 23a of the base 23 forming the recess 25 constitutes the rotation restricting surface 28 of the present invention. The rotation constraining surface 28 will be described later.
A first engaged portion 63, which will be described later, is engaged with a portion of the projecting portion 24 which is formed at the widthwise intermediate portion of the lower frame member 223. A portion of the projecting portion 24 in which the first engaged portion 63 is locked at an intermediate portion in the width direction is referred to as a first locking portion 24 a.
A second engaged portion 512, which will be described later, is engaged with a portion of the recess 25 which is formed in the middle of the lower frame member 223 in the width direction. A portion of the concave portion 25 at which the second engaged portion 512 is locked at an intermediate portion in the width direction is referred to as a second locking portion 25 a.

In the recess 25, wall portions 25 b and 25 b are formed on both sides of the second locking portion 25 a. The wall portion 25 b is provided to restrict the movement of the second engaged portion 512 engaged with the second engaging portion 25 a in the width direction.
The wall portion 25 b is formed in a plate shape whose plate surface is directed substantially in the width direction, and other than the front edge portion is continuous with the inner surface of the recess 25. The wall 25 b is integrally formed with the base 23 and the protrusion 24.

  As shown in FIG. 3, FIG. 5 and FIG. 6, the lumbar support 4 is attached to the lumbar support main body 41 receiving the load of the seated person sitting on the chair 11 (see FIG. 1) and the lower frame member 223 It has an attaching part 42 for supporting the support main body part 41 and a back cover 43 which covers the attaching part 42 from the rear side.

  The lumbar support main body 41 is disposed along the back of the facing 3 of the backrest 1. The lumbar support main body portion 41 extends from the both sides in the width direction of the main support portion 411 disposed at the widthwise central portion of the backrest 1 and the main support portion 411 outward in the width direction. It has an elevation operating portion (operation portion) 412 for raising and lowering, and an arm portion 413 which extends downward from the main support portion 411 and to which the height adjusting portion 7 of the attaching portion 42 is attached. The main support portion 411, the elevation operation portion 412, and the arm portion 413 are integrally formed.

The main support portion 411 has a load support surface member 8 having a load support surface 8 a for receiving a load of a seated person, and an outer peripheral frame portion 9 supporting an outer peripheral edge portion of the load support surface member 8. The load support surface 8 a of the load support surface material 8 is disposed on the front side of the outer peripheral frame 9.
The load support surface material 8 is formed of a urethane elastomer or the like, and is configured to be elastically deformable. The outer peripheral frame portion 9 is formed of a resin harder than the load support surface material 8 such as nylon, and is configured to be elastically deformable. The load support surface material 8 is softer than the outer peripheral frame portion 9 and is configured to be easily elastically deformed.
The load support surface material 8 and the outer peripheral frame portion 9 are integrally formed by means such as insert molding, for example, and are configured not to be separated from each other.

The outer peripheral frame portion 9 is formed in an annular shape, and is disposed in a direction in which the inner hollow portion 9a penetrates in the front-rear direction. With respect to the outer peripheral frame portion 9, the inner side (inner side empty portion 9a side) of the outer peripheral frame portion 9 is an inner side, and the outer side is an outer side.
In the present embodiment, the outer peripheral frame portion 9 has a first outer peripheral frame portion 91 and a second outer peripheral frame portion 92. In the present embodiment, the first outer peripheral frame portion 91 is disposed on the upper side of the second outer peripheral frame portion 92.
The first outer peripheral frame portion 91 is a member having a shape that is symmetrical in the width direction, and is formed in a rod shape extending gradually downward from the central portion in the width direction toward both sides in the width direction. The first outer peripheral frame portion 91 is curved so that the central portion in the width direction protrudes upward. The first outer peripheral frame portion 91 is curved throughout the extending direction (extending direction), and a curved portion (indicated by reference numeral 95) of the present invention is formed over the entire extending direction. The first outer peripheral frame portion 91 is formed so that the dimension in the width direction is longer than that in the vertical direction.

As shown in FIGS. 7 to 10, the first outer peripheral frame portion 91 is formed in substantially the same cross-sectional shape throughout the extending direction. The first outer peripheral frame portion 91 is formed longer in the front-rear direction than in the height direction (vertical direction). In the first outer peripheral frame portion 91, a notch 911 is formed on the lower side of the rear end portion, and a projecting portion 912 protruding upward is formed on the rear end portion.
Of the surface of the first outer peripheral frame 91, the surface continuous with the lower edge of the front surface 91a and extending rearward to the notch 911 is the inner surface 91b, and the upper edge of the front surface 91a is continuous with the rear edge to the projection 912 The surface extending in the direction is an outer surface 91c.

As shown in FIG. 3, FIG. 5 and FIG. 6, the second outer peripheral frame 92 is a member having a shape symmetrical in the width direction, and proceeds from the center in the width direction toward both sides in the width direction. It is formed in the shape of a rod that extends in the same manner. The second outer peripheral frame portion 92 is curved so that the central portion in the width direction protrudes downward. The second outer peripheral frame portion 92 is curved throughout the extending direction (extending direction), and a curved portion (indicated by reference numeral 95) of the present invention is formed over the entire extending direction. The second outer peripheral frame portion 92 is formed to have a longer dimension in the width direction than in the vertical direction.
An arm portion 413 is connected to a central portion (lower end portion) in the width direction of the second outer peripheral frame portion 92.

  As shown in FIGS. 7 to 10, portions of the second outer peripheral frame portion 92 to which the arm portion 413 is not connected (both side portions in the width direction) are formed in substantially the same cross-sectional shape throughout the extending direction There is. Both side portions in the width direction of the second outer peripheral frame portion 92 are formed longer in the front-rear direction than in the height direction. Notched portions 921 are formed on the upper side of the rear end portion of both side portions in the width direction of the second outer peripheral frame portion 92, and a projecting portion 922 protruding downward is formed on the rear end portion.

  The central portion in the width direction of the second outer peripheral frame portion 92 to which the arm portion 413 is connected is formed longer in the front-rear direction than in the height direction, and is curved such that the front surface 92a protrudes to the front side. The center portion in the width direction of the second outer peripheral frame portion 92 to which the arm portion 413 is connected has the arm portion 413 connected to the lower side of the rear end portion, and the front end portion protrudes to the front side relative to the arm portion 413 ing. In the vicinity of both end portions in the width direction at the central portion in the width direction to which the arm portion 413 of the second outer peripheral frame portion 92 is connected, the upper edge portion is continuous above the rear end portion until the notch portion 921 A side extending surface is an inner surface 92b, and a surface continuous with the lower edge of the front surface 92a and extending rearward to the projection 922 or the rear end is an outer surface 92c.

As shown in FIGS. 3, 5 and 6, one end 913 of the first outer peripheral frame portion 91 in the extending direction has a corner with one end 923 of the second outer peripheral frame portion 92 in the extending direction. The other end portion 914 of the first outer peripheral frame portion 91 in the extending direction is connected to the other end portion 924 of the second outer peripheral frame portion 92 so as to form the portion 93. It is connected to form a part 94.
In addition, between the 1st outer periphery frame 91 and the 2nd outer periphery frame 92, the member which mutually connects is not provided. The first outer peripheral frame portion 91 and the second outer peripheral frame portion 92 are not connected except at the corner portions 93 and 94. The outer peripheral frame portion 9 is formed to have a longer dimension in the width direction than in the vertical direction.
Elevating and lowering operation portions 412 are connected to corner portions 93 and 94 which are joint portions of the first outer peripheral frame portion 91 and the second outer peripheral frame portion 92, respectively.

  The load support surface material 8 is disposed inside the outer peripheral frame portion 9, and the entire periphery of the outer peripheral end portion is connected to the outer peripheral frame portion 9. The load support surface material 8 has a connection portion 81 connected to the outer peripheral frame portion 9 and a main body portion 82 disposed inside the connection portion 81 and having the load support surface 8 a formed thereon. The connection portion 81 and the main body portion 82 are integrally formed.

The vicinity of the edge of the main body 82 connected to the connecting portion 81 is referred to as a main body outer portion 821, and the inner side of the main body outer portion 821 is referred to as a main body inner portion 822. The main body portion 82 is curved so that the main body portion inner portion 822 protrudes to the front side relative to the main body outer portion 821, and is formed in a convex curved shape.
The cross-sectional shape of the main body by the vertical plane facing in the width direction in the main body 82 projects to the front side such that one point in the height direction of the main body inner portion 822 is located at the foremost end. As shown in FIG. 11, the cross-sectional shape of the main body according to the horizontal plane in the main body 82 is such that the main body inner side portion 822 projects to the front side relative to the main body outer side portion 821 The portion 822a is slightly recessed rearward of the portions 822b on both sides in the width direction of the inner portion 822 adjacent to the central portion.

The connection portion 81 includes a front connection portion (first connection portion) 811 connected to the front surfaces 91 a and 92 a of the outer peripheral frame portion 9 and an inner connection portion (second connection) connected to the inner surfaces 91 b and 92 b of the outer peripheral frame portion 9. Part) 812, a projecting part 813 disposed inside the notched parts 911 and 921 of the outer peripheral frame 9, and an outer connecting part (third connecting part) 814 connected to the outer surfaces 91 c and 92 c of the outer peripheral frame 9. And.
The inner connection portion 812 is formed continuously with the rear edge of the main body portion 82, and the inner surface and the outer surface are smoothly connected to the main body portion 82 without any step.
The front connection portion 811 is formed continuously with the main body portion 82, and protrudes outward from the boundary portion between the main body portion 82 and the inner connection portion 812.
The projecting portion 813 is formed to project outward from the rear end portion of the inner connecting portion 812.
The outer connection portion 814 is formed continuously to the front connection portion 811 so as to extend from the outer end of the front connection portion 811 to the rear side. The outer connection portion 814 is in contact with the front surface of the projecting portion 912 at a portion facing the projecting portion 912 of the outer peripheral frame portion 9.
The connection portion 81 is integrally formed with the main body portion 82 and the outer peripheral frame portion 9 so as not to be separated from the main body portion 82 and the outer peripheral frame portion 9.

The attachment portion 42 is a first attachment member 5 disposed on the front side of the lower frame member 223 and attached to the lower frame member 223, and a second attachment member 6 disposed on the rear side of the lower frame member 223 and attached to the lower frame member 223 And a height adjusting portion 7 attached to the lumbar support main body 41 and supported by the first mounting member 5 and the second mounting member 6 so as to be adjustable in height together with the lumbar support main body 41.
The first mounting member 5 and the second mounting member 6 are arranged to overlap in the front-rear direction such that the centers in the width direction of the first mounting member 5 and the second mounting member 6 coincide with each other.

  As shown in FIG. 12, the first attachment member 5 includes a first base 52 extending in the vertical direction, and a first extension extending diagonally downward from the lower edge of the first base 52 toward the rear side. And an outlet portion 51.

As shown in FIGS. 7 to 9, the first extending portion 51 is a portion (first locking portion) formed at a widthwise middle portion of the lower frame member 223 in the projecting portion 24 of the lower frame member 223. It is arrange | positioned inside the part (2nd latching | locking part 25a) formed in the width direction middle part of the lower frame material 223 among the recessed parts 25 in the front side of 24a.
The first extending portion 51 is a first contact portion 511 disposed so as to abut on the front surface and the lower surface of the bulging portion 27 of the projecting portion 24, and gradually from the first contact portion 511 downward. And a second engaged portion 512 extending rearward and disposed inside the recess 25.

The tip end portion of the second engaged portion 512 is in contact with the inner surface of the recess 25, and more specifically, the front surface 26 a of the plate-like portion 26 of the projecting portion 24 forming the recess 25 and the rotation restraining surface 28 (base 23 Contact with the upper surface 23a) of the
The rotation restraining surface 28 intersects the locus L1 of the second engaged portion 512 when the second engaged portion 512 disposed inside the recessed portion 25 pivots forward about the bulging portion 27. It is formed as.

As shown in FIG. 12, the first base 52 is formed so that the dimension in the width direction gradually decreases toward the top. As shown in FIG. 9, two bolt holes 521 are formed on the lower side of the first base 52 at intervals in the width direction. The bolts 522 for joining the first base 52 and the second base 62 of the second mounting member 6 are inserted through the two bolt holes 521, respectively. On the rear surface of the first base portion 52, a first base side contact portion 523 which contacts the second base side contact portion 623 formed on the front surface of the second base portion 62 of the second mounting member 6 is formed.
In the first base 52, a back cover engaging portion (not shown) to be engaged with the back cover 43 is appropriately formed.

As shown in FIGS. 7 and 12, in the first base 52, slits 53 extending in the vertical direction are formed substantially at the center in the width direction, and a pair of guide walls 54 are formed on both sides in the width direction of the slits 53. It is done.
As shown in FIG. 7, the arm portion 413 of the lumbar support main body 41 is disposed in front of the slit 53 and the guide wall 54, and the height adjustment portion 7 is disposed behind the slit 53 and the guide wall 54. Is configured as. The arm portion 413 of the lumbar support main body portion 41 and the height adjustment portion 7 are connected via the slit 53.

  As shown in FIGS. 7 and 12, on the rear surface of each of the pair of guide walls 54, a slide surface 541 whose rear surface is flat on the inner side in the width direction (the side close to each other in the width direction) is formed A plurality of notched surfaces 543 are formed with a plurality of notches 542 projecting rearward on the outer side (sides separated from each other in the width direction) of the upper and lower directions at intervals.

  As shown in FIG. 12, in the present embodiment, four division slits 551 penetrating in the front-rear direction are formed at intervals in the width direction on the lower side of the first extension portion 51 and the first base 52. . The four split slits 551 extend from the lower end (the tip of the second engaged portion 512) of the first extension 51 to the middle of the first base 52 in the height direction. The lower side of the first extension 51 and the first base 52 is divided into five in the width direction by forming four slits at intervals in the width direction. Assuming that each of the five divided arm portions 552 is a divided arm portion 552, the first contact portion 511 of each of the five divided arm portions 552 is the front and lower surfaces of the bulging portion 27 (see FIGS. 7 to 9) of the projecting portion 24. , And each second engaged portion 512 is configured to be disposed in the inside of the recess 25 (see FIGS. 7 to 9).

  The continuous portion of the first extending portion 51 and the first base 52 is continuous with each of the two split slits 551 disposed at both ends in the width direction of the four split slits 551 and is larger than the width of the split slit 551 An open hook portion opening 553 is formed. The hook portion 612 (see FIG. 13) of the second mounting member 6 described later is arranged in the hook portion opening 553.

  As shown in FIG. 13, the second mounting member 6 includes a second base 62 extending in the vertical direction, and a second extension extending diagonally downward from the lower edge of the second base 62 toward the rear side. And an outlet portion 61.

As shown in FIGS. 7 to 9, the second extending portion 61 is a portion (first locking portion) formed at a widthwise middle portion of the lower frame member 223 in the projecting portion 24 of the lower frame member 223. It arrange | positions along the rear surface 26b of the plate-like-part 26 of 24a. The second extending portion 61 is formed at a middle portion in the width direction, and a second contact portion 611 arranged to abut on the rear surface 26 b of the plate-like portion 26 of the projecting portion 24. And a hook portion 612 (see FIGS. 11 and 12) formed and hooked to the bulging portion 27 of the projecting portion 24 of the lower frame member 223.
The upper ends of the second contact portion 611 and the hook portion 612 are connected to the second base 62. The second contact portion 611 and the hook portion 612 are not directly connected.

  As shown in FIG. 9, in each of both end portions in the width direction, the front end portion of the second contact portion 611 is in contact with the upper surface of the bulging portion 27 of the projecting portion 24 and a portion on the rear side than the front end portion Is in contact with the rear surface 26 b of the plate-like portion 26 of the protrusion 24. The front end portion of the second contact portion 611 is in contact with the first contact portion 511 of the first mounting member 5.

Therefore, the bulging portion 27 of the projecting portion 24 is surrounded by the first contact portion 511 and the second contact portion 611 at both end portions in the width direction, and the plate-like portion 26 of the projecting portion 24 The first contact portion 511 and the second contact portion 611 are sandwiched from above and below. By joining the first attachment member 5 and the second attachment member 6 in this state, the first contact portion 511 and the second contact portion 611 are configured to be engaged with the projecting portion 24. . Here, both end portions in the width direction of the first contact portion 511 and the second contact portion 611 are combined to form a first engaged portion 63.
The first engaged portion 63 is formed with a concave portion 631 which is open on the rear side where the bulging portion 27 is fitted.
The second contact portion 611 is in contact with the rear surface 26 b of the plate-like portion 26 of the projecting portion 24 in the vicinity of the central portion in the width direction excluding both end portions in the width direction. It does not abut on the bulging portion 27.

  As shown in FIG. 13 and FIG. 10, the hook portion 612 is formed with a concave portion 612a that opens to the rear side. The hook portion 612 is disposed on the front side of the lower frame member 223, and is configured to be hooked on the bulging portion 27 of the projecting portion 24 from the front side so that the bulging portion 27 enters the recess 612a. The hook portion 612 disposed on the front side of the lower frame member 223 is disposed inside the hook portion opening 553 of the first attachment member 5.

The second base 62 is formed to be larger than the width of the arm portion 413 of the lumbar support main body 41 and smaller than the width of the first base 52 of the first mounting member 5. The second base 62 is formed to have a smaller height than the first base 52. The second base 62 is arranged to cover the lower side of the first base 52 from the rear side.
On the front surface of the second base 62, a groove 621 recessed toward the rear side is formed substantially at the center in the width direction over the entire height direction. The groove 621 is disposed on the rear side of the slit 53 of the first base 52 and the guide wall 54.
The second base 62 is formed with a bolt hole 622 through which a bolt 522 connecting the first base 52 and the second base 62 is inserted. On the front surface of the second base portion 62, a second base side contact portion 623 that contacts the first base side contact portion 523 formed on the rear surface of the first base portion 52 of the first mounting member 5 is formed. The first base side contact part 523 and the second base side contact part 623 may be formed flat with each other, or may be formed so as to fit each other.
In the second base 62, a back cover engaging portion (not shown) to be engaged with the back cover 43 is appropriately formed.

As shown in FIGS. 7 and 8, the height adjustment portion 7 is formed by the slit 53 of the first base 52 of the first mounting member 5 and the groove portion 621 of the guide wall 54 and the second base 62 of the second mounting member 6. It is provided between the two parts.
As shown in FIGS. 5, 7 and 8, the height adjustment unit 7 includes a slide plate 71 (see FIGS. 5 and 7) and a positioner 72 joined to the outer peripheral portion of the slide plate 71 as viewed from the front and rear direction. ,have.

  The slide plate 71 is formed in a block shape whose outer shape is a substantially rectangular shape elongated in the vertical direction when viewed from the front-rear direction. The slide plate 71 is formed with a bolt hole 712 through which a bolt 711 is inserted so as to be joined to the arm portion 413 of the lumbar support main body portion 41. The slide plate 71 is configured to be slidable up and down along the pair of slide surfaces 541.

The positioner 72 is formed in a frame shape in which an opening 721 penetrating in the front-rear direction is formed. The slide plate 71 is configured to be fitted in the opening 721 of the positioner 72 (see FIG. 14). The slit 53 and the guide wall 54 of the first base 52 of the first mounting member 5 and the groove 621 of the second base 62 of the second mounting member 6 are formed when the positioner 72 and the slide plate 71 are fitted to each other. It is placed between the parts.
The positioner 72 is provided with projections 722 that project forward on both sides in the width direction. The positioner 72 is configured to be vertically slidable along the pair of notch surfaces 543, and the protrusions 722 are configured to be engageable with the plurality of notches 542 of the notch surface 543.

  The arm portion 413 of the lumbar support main body portion 41 and the height adjustment portion 7 face each other with the slit 53 and the guide wall 54 of the first base 52 interposed therebetween, and are connected to each other by a pair of upper and lower bolts 711 penetrating the slit 53 There is. Thus, the arm portion 413 and the height adjustment portion 7 can slide in the vertical direction along the slit 53. The upper end of the positioner 72 abuts on the upper wall of the slit 53 so that the height adjustment unit 7 is restricted from moving upward, and the lower end of the positioner 72 abuts on the lower wall of the slit 53 to the lower side. Movement is regulated. Thereby, the moving range of the lumbar support main body 41 in the vertical direction is restricted.

When the height adjustment unit 7 is disposed on the lower side of the movement area, the second base 62 of the second mounting member 6 is disposed on the rear side of the height adjustment unit 7 and disposed on the upper side of the movement area If it is, the back cover 43 is disposed on the rear side.
The protrusion portions 722 of the positioners 72 of the height adjustment portion 7 engage with the notches 542 of a desired height, so that the arm portion 413 and the height adjustment portion 7 have desired height positions of a plurality of stages along the slits 53. It is fixed to Thus, the lumbar support main body 41 can be disposed at a desired height.

  The back cover 43 has an engaging portion (not shown) engageable with the back cover engaging portion of the first base 52 and the back cover engaging portion of the second base 62, and the engaging portion is the first The rear cover engaging portion of the base 52 and the rear cover engaging portion of the second base 62 are engaged with each other to be attached to the first attachment member 5 and the second attachment member 6.

The mounting of the lumbar support 4 on the lower frame member 223 is performed as follows.
First, the first attachment member 5 and the second attachment member 6 are attached to the lower frame member 223.
The first mounting member 5 is disposed on the front side of the lower frame member 223, and the first contact portion 511 is brought into contact with the bulging portion 27 of the projecting portion 24 of the lower frame member 223. Is inserted into the recess 25 of the lower frame member 223.
Before and after the installation of the first attachment member 5, as shown in FIGS. 15 and 16, the second attachment member 6 is disposed on the rear side of the lower frame member 223, and the second abutment portion 611 is disposed on the lower frame member 223. It abuts on the rear surface 26 b of the plate-like portion 26 of the projection 24. In addition, illustration of the 1st attachment member 5 is abbreviate | omitted in FIG. 15 and FIG.
Further, the hook portion 612 of the second mounting member 6 is hooked from the front side to the bulging portion 27 of the projecting portion 24 of the lower frame member 223 and disposed inside the hook portion opening 553 of the first mounting member 5.
Then, the first base side contact portion 523 of the first base portion 52 and the second base side contact portion 623 of the second base portion 62 are brought into contact in the front-rear direction, and the first base portion 52, the second base portion 62 and the bolt 522 Sign in
When the first mounting member 5 and the second mounting member 6 are joined in this way, the positions of the first mounting member 5 and the second mounting member 6 are fixed, and the first mounting member 5 and the second mounting member 6 It will be in the state attached to lower frame material 223. At this time, the tip end portion of the second engaged portion 512 is in contact with the upper surface 23 a (rotation restraining surface 28) of the base 23.

Subsequently, the lumbar support main body 41 is attached to the first attachment member 5 and the second attachment member 6.
The lumbar support main body 41 is disposed on the front side of the slit 53 of the first base 52, and the height adjustment unit 7 is disposed on the rear side of the slit 53 of the first base 52. Then, the arm portion 413 of the lumbar support main body portion 41 and the height adjustment portion 7 are joined by the bolt 711 through the slit 53. The projection 722 of the positioner 72 of the height adjustment unit 7 is engaged with the notch 542 of the guide wall 54.

Subsequently, the back cover 43 is installed. The back cover 43 is disposed behind the first base 52 and the second base 62 and engaged with the first base 52 and the second base 62. Thereby, the lumbar support 4 is mounted on the backrest main body 22.
Thus, the lumbar support 4 is attached to the lower frame member 223.

Next, the behavior of the lumbar support 4 when the seated person leans back will be described.
When the seated person leans back, as shown in FIG. 17A, first, the load supporting surface material 8 in the main support portion 411 of the lumbar support main body 41 is separated from the seated person from the front side via the surface material 3 Receive a load toward the side. As a result, the load bearing surface member 8 is elastically deformed so as to be crushed rearward. The load support surface member 8 is integrally formed with the outer peripheral frame portion 9 but is disposed on the front side of the outer peripheral frame portion 9 and is softer and easier to elastically deform than the outer peripheral frame portion 9. The load bearing surface material 8 is elastically deformed prior to the portion 9.

As shown in FIG. 17B, when the load acting on the main support portion 411 from the front side to the rear side is further increased, the load support surface material 8 tends to move to the rear side. In addition, the load bearing surface material 8 is further crushed and tends to spread outward. For this reason, a load directed from the load support surface material 8 to the outer peripheral frame portion 9 acts on the rear side and the outer side.
As a result, the outer peripheral frame portion 9 is elastically deformed so as to spread outward. The outer peripheral frame portion 9 tries to move to the rear side, but since the lower side is connected to the arm portion 413 and movement in the front-rear direction is restricted, elastic deformation is obliquely performed so that the upper side is slightly backward. Do.

As described above, the load is transmitted to the outer peripheral frame portion 9 from the connection portion 81 of the load support surface material 8. The front connection portion 811 of the connection portion 81 is connected to the front surfaces 91a and 92a of the outer peripheral frame portion 9, the inner connection portion 812 is connected to the inner surfaces 91b and 92b of the outer peripheral frame portion 9, and the front connection portion 811 and the inner connection The portion 812 is continuous with the main portion 82 on which the load support surface 8 a is formed.
Therefore, the load from the load support surface member 8 toward the rear from the front side is efficiently transmitted to the outer peripheral frame 9 via the front connection portion 811, and the load from the inner side to the outer side is the outer peripheral frame of the inner connection portion 812. Efficiently transmit to the part 9
By elastically deforming the outer peripheral frame portion 9 so as to expand outward, the inside of the outer peripheral frame portion 9 is expanded, so that the load supporting surface material 8 is further elastically deformed and crushed.

  The restoring force of the load support surface material 8 and the outer peripheral frame 9 acts on the main support portion 411 elastically deformed by the load from the front side acting on the load support surface 8a as described above. The restoring force of the outer peripheral frame portion 9 acts on the front side and the inside, and the restoring force of the load support surface material 8 acts on the front side. The main support portion 411 is configured to support the seated person's waist by this restoring force. In the main support portion 411, when no load is applied from the front side, the outer peripheral frame portion and the load support surface member are respectively restored, and the shape is restored.

Next, the operation and effects of the lumbar support (the chair load supporting member) according to the above-described embodiment will be described with reference to the drawings.
In the lumbar support 4 according to the present embodiment, the load support surface member 8 is configured to be elastically deformed more easily than the outer peripheral frame portion 9. However, when the load is further increased, the load is transmitted from the load support surface material 8 to the outer peripheral frame portion 9, and the outer peripheral frame portion 9 is elastically deformed. The load transmitted to the outer peripheral frame portion 9 is a load in the direction in which the load support surface material 8 is elastically deformed, so the outer peripheral frame portion 9 is elastically deformed outward and rearward. As a result, the restraint force that the outer peripheral frame portion 9 restrains the elastic deformation of the load support surface material 8 is weakened, so that the load support surface material 8 can also be elastically deformed. As described above, it is possible to improve the allowable range of the amount of deformation when being elastically deformed by receiving the load of the load support surface material 8.

Further, the front connection portion 811 connected to the front surfaces 91 a and 92 a of the outer peripheral frame portion 9, and the inner connection portion 812 connected to the inner surfaces 91 b and 92 b of the outer peripheral frame portion 9. ,have. Accordingly, the load can be easily transmitted from the front connection portion 811 to the outer peripheral frame portion from the front side to the rear side, and the load can be easily transmitted from the inner connection portion 812 to the outer peripheral frame portion 9 from the inner side to the outer side. .
The direction of the load transmitted to the outer peripheral frame portion 9 by the elastic deformation of the load support surface material 8 is a direction mainly from the front side to the rear side and a direction from the inner side to the outer side of the outer peripheral frame portion. Therefore, when the load of the seat occupant acts on the load support surface 8a, the load can be efficiently transmitted from the load support surface material 8 to the outer peripheral frame portion 9, and the outer peripheral frame portion 9 is efficiently elastically deformed. be able to. As a result, the load support surface material 8 can be further elastically deformed, and the allowable range of the amount of deformation when the load support surface material 8 is elastically deformed by receiving the load can be improved.

  Further, the connection portion 81 has the third connection portion 814 connected to the outer peripheral frame portion 9 from the outside, whereby the connection portion 81 is reliably connected to the outer peripheral frame portion 9 and the load support surface material 8 is the outer periphery It is possible to prevent the frame 9 from coming off.

  Further, the outer peripheral frame portion 9 has a first outer peripheral frame portion 91 curved upward and a second outer peripheral frame portion curved downward, and the respective end portions intersect to form a corner portion and are connected It is done. Thus, the first outer peripheral frame portion 91 and the second outer peripheral frame portion 92 are elastically deformed in the vertical direction so that the first outer peripheral frame portion 91 and the second outer peripheral frame portion 92 are separated from each other, starting from the junction of the first outer peripheral frame 91 and the second outer peripheral frame 92 It can be made to curve. Thus, the inside of the outer peripheral frame portion 9 is expanded, and the allowable range of the amount of deformation when elastically deformed by receiving the load of the load support surface material 8 can be improved.

  Further, since the dimension in the width direction of the outer peripheral frame portion 9 is larger than the dimension in the vertical direction, the outer peripheral frame portion 9 is more easily elastically deformed in the vertical direction than in the width direction. For this reason, the load supporting surface material 8 can be configured to be easily elastically deformed in the vertical direction than in the width direction.

  In addition, since the lifting and lowering operation unit 412 is provided at the joint portion between the first outer peripheral frame 91 and the second outer peripheral frame 92, the user holds the lifting and lowering operation unit 412. When the position adjustment is performed, the load that the outer peripheral frame portion 9 receives from the lifting and lowering operation unit 412 acts on the joint portion between the first outer peripheral frame portion 91 and the second outer peripheral frame portion 92. The joint portion between the first outer peripheral frame portion 91 and the second outer peripheral frame portion 92 has higher strength than the other portions of the first outer peripheral frame portion 91 and the second outer peripheral frame portion 92. Therefore, even if the position adjustment performed by the user by holding the lifting operation unit 412 is frequently performed, the outer peripheral frame 9 can be prevented from being damaged or deformed by the load received from the lifting operation unit 412. .

As mentioned above, although embodiment of the load support member for chairs by this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning.
For example, although the load support member for a chair is the lumbar support 4 in the above embodiment, the load support member may be a load supporting member such as a headrest other than the lumbar support 4.
Moreover, in said embodiment, although the connection part 81 of the load support surface material 8 is provided with the outer side connection part 814 and the protrusion part 813, the outer connection part 814 and the protrusion part 813 do not need to be provided. . The connection portion 81 of the load support surface material 8 may be connected to at least the base end side in the direction in which the load support surface 8 a receives a load with respect to the outer peripheral frame portion 9 and the inside.

Moreover, in said embodiment, the outer peripheral frame 9 has the 1st outer peripheral frame 91 and the 2nd outer peripheral frame 92, each curves outside, and the curved part 95 is formed over the whole extension direction. There is. On the other hand, the curved portion 95 may be formed on only one of the first outer peripheral frame portion 91 and the second outer peripheral frame portion 92, or the curved portion 95 may not be formed on both sides.
In addition, the curved portions 95 may be formed at a plurality of portions instead of the whole of the first outer peripheral frame portion 91 instead of the whole. In addition, the curved portions 95 may be formed at a plurality of portions instead of the whole of the second outer peripheral frame portion 92.
In addition, the outer peripheral frame portion 9 may be formed in a circular or rectangular frame shape, and the outer shape may be appropriately set as long as an empty portion is formed inside.
Further, in the above embodiment, although the dimension in the width direction of the outer peripheral frame portion 9 is larger than the dimension in the vertical direction, the ratio of the dimension in the width direction and the dimension in the vertical direction may be set appropriately.

  Further, in the above embodiment, the lifting and lowering operation unit 412 is provided at the joint portion of the first outer peripheral frame 91 and the second outer peripheral frame 92, but the first outer peripheral frame 91 and the second outer peripheral frame It may be provided other than the junction with 92. Moreover, the form of the raising / lowering operation part 412 may be a form other than the above.

4 Lumber Support (Load Support Member for Chair)
Reference Signs List 8 load bearing surface material 8a load bearing surface 9 outer peripheral frame 11 chair 41 lumbar support main body 81 connection 82 main body 91 first outer peripheral frame 92 second outer peripheral frame 95 curved portion 411 main support 412 lifting and lowering operation part ( Operation unit)
811 Front connection (first connection)
812 Inner connection (second connection)
814 Outer connection (third connection)

Claims (6)

A load supporting member for a chair, which is attached to a chair and receives a load directed from one side to the other side in one direction of a seater of the chair,
An elastically deformable load support surface member having a load support surface which is formed in a convex curved shape protruding to one side in the one direction and receives the load;
An elastically deformable outer peripheral frame portion formed in an annular shape along the outer peripheral edge of the load support surface material to support the load support surface material;
The load support surface member is provided at an outer peripheral edge and connected to the outer peripheral frame portion, and the load support surface is formed continuously with the connection portion inside the connection portion. A main body portion, and is configured to be more easily elastically deformed than the outer peripheral frame portion,
The connection portion has a first connection portion connected from one side in the one direction to the outer peripheral frame portion, and a second connection portion connected from the inner side to the outer peripheral frame portion. A load supporting member for a chair characterized by   The load supporting member for a chair according to claim 1, wherein the connection portion has a third connection portion connected from the outside to the outer peripheral frame portion.   The load supporting member for a chair according to claim 1 or 2, wherein the outer peripheral frame portion has a curved portion which curves outward at least in part. The outer peripheral frame portion extends along a portion of the first outer peripheral frame portion extending along a portion of the outer peripheral edge portion of the load supporting surface material, and a second outer peripheral portion extending along other than the portion of the outer peripheral edge portion of the load supporting surface material Having a frame portion,
One end of the first outer peripheral frame and one end of the second outer peripheral frame are joined to intersect with each other,
The other end of the first outer peripheral frame and the other end of the second outer peripheral frame are joined to intersect with each other,
The first outer peripheral frame portion has the curved portion curved toward the side separated from the second outer peripheral frame portion,
The load supporting member for a chair according to claim 3, wherein the second outer peripheral frame portion includes the curved portion which is curved on a side away from the first outer peripheral frame portion.   The load supporting member for a chair according to claim 4, wherein a dimension in a width direction which is a horizontal direction orthogonal to the one direction is formed larger than a dimension in the vertical direction of the outer peripheral frame portion.   The joint portion between the first outer peripheral frame portion and the second outer peripheral frame portion is provided with an operation portion which can be gripped by the user when adjusting the positions of the load supporting surface material and the outer peripheral frame portion. The load support member for a chair according to claim 4 or 5, characterized in that:

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